ATMEGA164A-PU Atmel, ATMEGA164A-PU Datasheet - Page 55
Manufacturer Part Number
IC MCU AVR 16K 20MHZ 40PDIP
Specifications of ATMEGA164A-PU
I²C, SPI, UART/USART
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
Program Memory Size
16KB (8K x 16)
Program Memory Type
512 x 8
1K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
No. Of I/o's
Eeprom Memory Size
Ram Memory Size
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Internal Voltage Reference
Voltage Reference Enable Signals and Start-up Time
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P features an internal bandgap ref-
erence. This reference is used for Brown-out Detection, and it can be used as an input to the
Analog Comparator or the ADC.
The voltage reference has a start-up time that may influence the way it should be used. The
start-up time is given in
reference is not always turned on. The reference is on during the following situations:
1. When the BOD is enabled (by programming the BODLEVEL [2:0] Fuse).
2. When the bandgap reference is connected to the Analog Comparator (by setting the
3. When the ADC is enabled.
Thus, when the BOD is not enabled, after setting the ACBG bit or enabling the ADC, the user
must always allow the reference to start up before the output from the Analog Comparator or
ADC is used. To reduce power consumption in Power-down mode, the user can avoid the three
conditions above to ensure that the reference is turned off before entering Power-down mode.
ACBG bit in ACSR).
”System and Reset Characteristics” on page
335. To save power, the